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I would like to be able to implement the following logic.

(if (developer-opened-file-with-emacs)
    (do nothing, get on with working as fast as possible)
    (load fancy splash screen that may take a while))

What would be a good way to detect this case so that I may use this to choose what kind of startup behavior to use?

Another way to say this is: Will emacs show *scratch* buffer once it's started.

Examples of opening emacs with a file include:

emacs somefile.txt

Or using elisp:

emacs --eval '(progn (find-file "test.txt"))'

Note that checking argv isn't a good option since elisp may be used in a command line argument to open files.

ideasman42
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  • How did the developer open a file with Emacs; e.g., double-clicking on a file (with an extension associated with Emacs) from Finder.app on OSX and Emacs was built --with-ns? – lawlist Feb 13 '18 at 00:02
  • Generally I don't think it should matter? To avoid ambiguity, I added examples using argument or elisp. (not sure of other ways) – ideasman42 Feb 13 '18 at 00:07
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    Hm, maybe your predicate is (cl-remove-if-not #'buffer-file-name (buffer-list)). But maybe there is some history mechanism interfering which opens the last file buffers automagically... – Tobias Feb 13 '18 at 01:27
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    Checking buffer-file-name works as long as this isn't in the body of the init file (worth adding as an answer?) – ideasman42 Feb 14 '18 at 03:56
  • @ideasman42 yes, it worth an answer – Hettomei Nov 17 '20 at 07:46

1 Answers1

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As pointed out in the comment by @ideasman42, you can use buffer-file-name (both variable and function):

(defun tim/run-after-emacs-is-loaded ()
  (if (not buffer-file-name)
    (tim/load-session)))

(add-hook 'window-setup-hook #'tim/run-after-emacs-is-loaded)
Hettomei
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  • thanks for this. I'm looking to replace the splash screen with showing the contents of my ~ directory. Do you have any advice why (find-file "~") in the hook doesn't do anything? – Nicolas78 Jul 22 '21 at 22:01